1 #ifndef __NET_IP_TUNNELS_H
2 #define __NET_IP_TUNNELS_H 1
4 #include <linux/if_tunnel.h>
5 #include <linux/netdevice.h>
6 #include <linux/skbuff.h>
7 #include <linux/types.h>
8 #include <linux/u64_stats_sync.h>
9 #include <net/dsfield.h>
10 #include <net/gro_cells.h>
11 #include <net/inet_ecn.h>
13 #include <net/rtnetlink.h>
15 #if IS_ENABLED(CONFIG_IPV6)
17 #include <net/ip6_fib.h>
18 #include <net/ip6_route.h>
21 /* Keep error state on tunnel for 30 sec */
22 #define IPTUNNEL_ERR_TIMEO (30*HZ)
24 /* 6rd prefix/relay information */
25 #ifdef CONFIG_IPV6_SIT_6RD
26 struct ip_tunnel_6rd_parm {
27 struct in6_addr prefix;
34 struct ip_tunnel_prl_entry {
35 struct ip_tunnel_prl_entry __rcu *next;
38 struct rcu_head rcu_head;
42 struct ip_tunnel __rcu *next;
43 struct hlist_node hash_node;
44 struct net_device *dev;
46 int err_count; /* Number of arrived ICMP errors */
47 unsigned long err_time; /* Time when the last ICMP error
50 /* These four fields used only by GRE */
51 __u32 i_seqno; /* The last seen seqno */
52 __u32 o_seqno; /* The last output seqno */
53 int hlen; /* Precalculated header length */
56 struct ip_tunnel_parm parms;
59 #ifdef CONFIG_IPV6_SIT_6RD
60 struct ip_tunnel_6rd_parm ip6rd;
62 struct ip_tunnel_prl_entry __rcu *prl; /* potential router list */
63 unsigned int prl_count; /* # of entries in PRL */
65 struct gro_cells gro_cells;
68 #define TUNNEL_CSUM __cpu_to_be16(0x01)
69 #define TUNNEL_ROUTING __cpu_to_be16(0x02)
70 #define TUNNEL_KEY __cpu_to_be16(0x04)
71 #define TUNNEL_SEQ __cpu_to_be16(0x08)
72 #define TUNNEL_STRICT __cpu_to_be16(0x10)
73 #define TUNNEL_REC __cpu_to_be16(0x20)
74 #define TUNNEL_VERSION __cpu_to_be16(0x40)
75 #define TUNNEL_NO_KEY __cpu_to_be16(0x80)
85 #define PACKET_REJECT 1
87 #define IP_TNL_HASH_BITS 10
88 #define IP_TNL_HASH_SIZE (1 << IP_TNL_HASH_BITS)
90 struct ip_tunnel_net {
91 struct hlist_head *tunnels;
92 struct net_device *fb_tunnel_dev;
95 int ip_tunnel_init(struct net_device *dev);
96 void ip_tunnel_uninit(struct net_device *dev);
97 void ip_tunnel_dellink(struct net_device *dev, struct list_head *head);
98 int __net_init ip_tunnel_init_net(struct net *net, int ip_tnl_net_id,
99 struct rtnl_link_ops *ops, char *devname);
101 void __net_exit ip_tunnel_delete_net(struct ip_tunnel_net *itn);
103 void ip_tunnel_xmit(struct sk_buff *skb, struct net_device *dev,
104 const struct iphdr *tnl_params, const u8 protocol);
105 int ip_tunnel_ioctl(struct net_device *dev, struct ip_tunnel_parm *p, int cmd);
106 int ip_tunnel_change_mtu(struct net_device *dev, int new_mtu);
108 struct rtnl_link_stats64 *ip_tunnel_get_stats64(struct net_device *dev,
109 struct rtnl_link_stats64 *tot);
110 struct ip_tunnel *ip_tunnel_lookup(struct ip_tunnel_net *itn,
111 int link, __be16 flags,
112 __be32 remote, __be32 local,
115 int ip_tunnel_rcv(struct ip_tunnel *tunnel, struct sk_buff *skb,
116 const struct tnl_ptk_info *tpi, bool log_ecn_error);
117 int ip_tunnel_changelink(struct net_device *dev, struct nlattr *tb[],
118 struct ip_tunnel_parm *p);
119 int ip_tunnel_newlink(struct net_device *dev, struct nlattr *tb[],
120 struct ip_tunnel_parm *p);
121 void ip_tunnel_setup(struct net_device *dev, int net_id);
123 /* Extract dsfield from inner protocol */
124 static inline u8 ip_tunnel_get_dsfield(const struct iphdr *iph,
125 const struct sk_buff *skb)
127 if (skb->protocol == htons(ETH_P_IP))
129 else if (skb->protocol == htons(ETH_P_IPV6))
130 return ipv6_get_dsfield((const struct ipv6hdr *)iph);
135 /* Propogate ECN bits out */
136 static inline u8 ip_tunnel_ecn_encap(u8 tos, const struct iphdr *iph,
137 const struct sk_buff *skb)
139 u8 inner = ip_tunnel_get_dsfield(iph, skb);
141 return INET_ECN_encapsulate(tos, inner);
144 static inline void tunnel_ip_select_ident(struct sk_buff *skb,
145 const struct iphdr *old_iph,
146 struct dst_entry *dst)
148 struct iphdr *iph = ip_hdr(skb);
150 /* Use inner packet iph-id if possible. */
151 if (skb->protocol == htons(ETH_P_IP) && old_iph->id)
152 iph->id = old_iph->id;
154 __ip_select_ident(iph, dst,
155 (skb_shinfo(skb)->gso_segs ?: 1) - 1);
158 static inline void iptunnel_xmit(struct sk_buff *skb, struct net_device *dev)
161 int pkt_len = skb->len - skb_transport_offset(skb);
162 struct pcpu_tstats *tstats = this_cpu_ptr(dev->tstats);
166 err = ip_local_out(skb);
167 if (likely(net_xmit_eval(err) == 0)) {
168 u64_stats_update_begin(&tstats->syncp);
169 tstats->tx_bytes += pkt_len;
170 tstats->tx_packets++;
171 u64_stats_update_end(&tstats->syncp);
173 dev->stats.tx_errors++;
174 dev->stats.tx_aborted_errors++;
177 #endif /* __NET_IP_TUNNELS_H */